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Effets De La Fragmentation À Long Terme De L'habitat Sur Une Communauté D

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Effets De La Fragmentation À Long Terme De L'habitat Sur Une Communauté D View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by I-Revues EFFECTS OF LONG-TERM HABITAT FRAGMENTATION ON A WETLAND BIRD COMMUNITY Mariano PARACUELLOS1 RÉSUMÉ. — Effets de la fragmentation à long terme de l’habitat sur une communauté d’oiseaux de zone humide. — L’évolution au cours des 50 dernières années d’une zone humide d’importance interna- tionale pour les oiseaux de la province d’Almeria en Espagne, Albuferas d’Adra, qui a été soumise à de fortes pressions agricoles, a été analysée, de même que les modifi cations de sa communauté avienne. La fragmentation de l´habitat pendant toute la deuxième moitié du 20e siècle a principalement concerné la rose- lière périphérique dont les caractéristiques (surface, isolement des fragments) ont été fortement modifi ées par les activités agricoles. Ce sont ces changements qui ont vraisemblablement causé la perte de plusieurs espèces rares de passereaux paludicoles nicheurs très dépendants de la roselière. Les espèces plus abondan- tes à l’échelle régionale sont celles qui semblent avoir le mieux résisté à la fragmentation de la roselière, apparemment parce qu’elles disposaient de plus d’individus susceptibles de coloniser les fragments. La conservation, la création ou la restauration de vastes zones humides et de leurs roselières sont nécessaires pour maintenir ou récupérer le plus grand nombre d’espèces aviennes paludicoles dans le sud de l’Espagne et permettre la nidifi cation d’espèces menacées comme la Lusciniole à moustaches (Acrocephalus melano- pogon) et le Bruant des roseaux (Emberiza schoeniclus). SUMMARY. — The recent changes of an internationally important wetland for birds, Albuferas of Adra (Almería province, Spain), were analysed focussing on the long-term human impact on the landscape and its biological consequences for the avian community. Habitat fragmentation throughout the second half of the 20th century affected mainly the peripheral reed beds (Phragmites australis) most accessible to humans. These changes presumably caused the loss of the only nesting marsh passerines, the bird guild most depen- dent on emergent vegetation. More abundant species had greater capacity to occupy reed-bed patches appa- rently by having more colonizing individuals than did rarer species. Conservation, creation or restoration of marsh habitats in endangered and ecologically valuable wetlands are vital to maintain and recover the greatest number of marsh species, such as the threatened Moustached Warbler (Acrocephalus melanopogon) and Reed Bunting (Emberiza schoeniclus). Wetlands are of great conservational interest for having among the world’s highest bio- logical diversity and productivity (e.g., Whittaker & Likens, 1973 ; Gibbs, 1993 ; Casado & Montes, 1995). Furthermore, various globally threatened avian species depend on them (Tucker & Evans, 1997 ; IUCN, 2007). In recent decades, wetlands have declined worldwide due mainly to habitat loss by human activities, negatively affecting birds, particularly rarer or more sensitive species (Owen & Black, 1990 ; Finlayson et al., 1992 ; Tscharntke, 1992 ; Weller, 1994 ; Casado & Montes, 1995 ; Tucker & Evans, 1997 ; Foppen, 2001 ; Parsons et al., 2002). Nevertheless, works which empirically analyse long-term habitat loss and its consequences on species rich- ness are scarce (see Shafer, 1990 ; Opdam, 1991 ; Wu et al., 1997 ; Duncan et al., 1999). 1 Aquatic Ecology and Aquiculture Research Group, University of Almería, Apdo. 110. E-04770, Adra, Almería, Spain. E-mail : [email protected] Rev. Écol. (Terre Vie), vol. 63, 2008. – 227 – The wetland of Albuferas of Adra (Almería, Spain) is a complex protected since 1989 for its high ecological value (Law 2/1989, 18 July, BOJA 60, 27 July 1989, Andalusian Govern- ment), being considered of international importance for birds (Ramsar site from 1994, BOE 273, 15 November 1994, Spain ; Specially Protected Area from 2002, according to the Birds Directive 79/409/EEC, DOCE L 103, 25 April 1979). Because of its importance, the Albuferas of Adra has received broad attention, with numerous surveys of its avifauna from the second half of the 20th century on. However, the wetland has been encroached upon for agriculture (Sermet, 1950), particularly greenhouses from the 1980s, fi lling in marsh zones (Paracuellos, 2006a). With information concerning the morphological and avian changes in the wetland over the last fi fty years also being available, Adra serves as a good case study to evaluate the repercussions of the long-term landscape alteration over time on the bird community of an endangered and ecologically valuable wetland surrounded by a semiarid environment. In this study, I analyse the biological repercussions of the alterations in the Albuferas of Adra from middle of the 20th century to beginning of the 21st century, examining three pat- terns : (1) the temporal trends in the spatial morphology (habitat size, fragmentation, isolation and interface degrees) of the wetland ; (2) the equivalent occurrence patterns of the avifauna, such as the threatened Moustached Warbler (Acrocephalus melanopogon) and the Reed Bun- ting (Emberiza schoeniclus) ; and (3) the relationships between the morphological characteris- tics of the wetland and the composition of their avifauna over time. MATERIAL AND METHODS Albuferas of Adra, located in a semi-arid region (Capel, 1990), is a Mediterranean wetland complex in the delta of the Adra river (36º 47’N, 2º 59’W, Almería, south-eastern Spain ; Martínez Vidal & Castro, 1990). The wetland complex consisted, some 50 years ago, of two main lagoons > 80 ha with > 3 m depth of permanent, brackish, and eutrophic open waters circled by belts of emergent vegetation, the peripheral territory being occupied by sandy coastal formations, where human presence was scarce. However, from the end of the 20th century onwards, nearly all the surrounding land of marshes was taken over by agriculture, predominantly greenhouses (Gómez Mercado & Paracuellos, 1995-96 ; Fig. 1). The submerged vegetation is composed mainly of Sago Pondweed (Potamogeton pectinatus) and Spiny Naiad (Najas marina). In the shallower surrounding zones a reed bed developed, where Common Reed (Phragmites australis) predominates, although Tamarisk (Tamarix canariensis), Cattails (Typha sp.) and Sedge (Cladium mariscus) are also common (Gómez Mercado & Paracuellos, 1995-96 ; Ortega et al., 2004). The recent evolution of the Albuferas of Adra was analysed using 8 aerial photographs taken successively from 1957 to 2000 (the average period between two consecutive photographs was 5.6 years, varying between 2 and 15 years). The following variables were calculated for each photo, delimiting the different habitat types by means of digital planimetry used with the ArcView GIS, 3.1 program (Environmental Systems Research Institute, Inc., 1992-98) : (1) the open water, emergent vegetation, and total wetland surface area ; (2) the average area of the open water, emergent vegetation, and total wetland patches ; (3) the total perimeter length of the wetland patches all together ; (4) the perimeter-total wetland surface area relationship (perimeter divided by surface area) ; (5) the perimeter complexity of the total wetland (according to the border length divided by the circumference of a circle of equivalent area, 2√(π x surface) ; Polis & Hurd, 1996) ; and (6) the average value of the distance to the nearest wetland patch, taking into account all the present patches. For the analysis, a habitat patch was defi ned as independent, isolated, and at least 20 m away from the nearest patch habitat area (open water, emergent vegetation, or total wetland). A search for information was made on the bird species sighted in the lagoons during this time interval. The data came mainly from the literature and databases from the Andalusian Government. Only works on presence/absence using systematic surveys of direct observation and identifi cation of the species and their stay in the wetland during wintertime or breeding were used. This information was complemented with data from zoological collections from the CSIC, statements from the staff of the CSIC and the Andalusian Government, knowledgeable long-time residents of the zone, and unpublished data of the author (Appendix). Due to the systematic avian search in all the interannual stages by two or more independent authors, it was assumed that surveys were comparable among stages to simple data of presence/ absence, and that when a species was not detected it was truly absent. In the study, only the swimmer and diver waterbirds (grebes Podicipedidae, wildfowl Anatidae, and some rails Rallidae) and the marsh passerines (Passeriformes linked to wetlands) were taken into account, as these were the groups best represented in the Albuferas of Adra (Paracuellos, 1991), very dependent on their ecosystem (Perrins & Ogilvie, 1998) and sensitive to habitat patchiness (Paracuellos & Tellería, 2004 ; Paracuellos, 2006b, 2006c). The two guilds were analysed separately in relation to the biotopes to which they were mainly associated (waterbirds vs. open water, marsh passerines vs. emergent vegetation), because of the different use that they normally made of the wetlands (van der Hut, 1986 ; Owen & Black, 1990 ; Weller, 1994). Species that were hidden in the vegetation or appeared accidentally or in passing were excluded from the study. The data were divided into 7 stages (1950-69, 1970-79, 1980-84, 1985-89, 1990-94, 1995-99, and 2000-04), separating winter (Nov.-Feb.)
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